אסיף מאגר המחקר החקלאי

Mortality rate of adult ticks due to infection by entomopathogenic nematodes

Year:

2000

Source of publication :

Authors :

Volume :

86

Co-Authors:

Samish, M., Kimron Veterinary Institute, P.O. Box 12, Bet Dagan 50250, Israel
Alekseev, E., Kimron Veterinary Institute, P.O. Box 12, Bet Dagan 50250, Israel
 

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Abstract:

The mortality of Boophilus annulatus, Hyalomma excavatum, Rhipicephalus bursa, and Rhipicephalus sanguineus adult ticks was recorded after their exposure in petri dishes to 5 entomopathogenic nematode strains. The strains used were DT and Mexican of Steinernema carpocapsae, Hb HP88 of Heterorhabditis bacteriophora, and IS-3 and IS-5 of Heterorhabditis sp. The most rapid killing rates (LT 50 and LT 90) were observed for B. annulatus ticks (0.8-5.0 days). Most unfed males died 0.3-2.8 days after the unfed females, whereas even more time (0.8-8.0 days) passed before engorged females died. In most bioassays, the IS-3 and IS-5 strains of Heterorhabditis sp. nematodes appear to be the most pathogenic for ticks and, in most cases, killed ticks several days before the other 3 nematode strains. Unfed adult ticks exposed to nematodes died within less time than it takes for adults to complete their prefeeding period after molting.

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